Air flow control unit, system for ventilation system of buidling and method for controlling ventilation of building
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Traditional air flow control units in ventilation systems face challenges in measuring and controlling low air flow velocity and pressure, especially in environments with flow disturbances, requiring significant space for accurate pressure measurement.
Innovation Solution
An air flow control unit with a damper and multiple measurement areas on both sides of the damper, each equipped with a measurement probe and a wall to enhance pressure difference measurement, allowing for more precise pressure measurement and control closer to the damper, reducing the need for extensive space.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional pressure sensors are used to measure air pressure inside the duct, then air flow control is possible, but measurement precision deteriorates due to insufficient measurement pressure and flow disturbances
Solution Approach 1:
The measurement function is segmented into multiple measurement areas (first measurement area on inlet side, second measurement area on outlet side) with separate measurement probes. This segmentation allows each probe to measure pressure at specific locations protected from flow disturbances, improving overall measurement precision and reliability
Solution Approach 2:
Walls are introduced as intermediary structures between the measurement probes and the damper blade. These walls protect the measurement points from direct exposure to flow disturbances caused by the damper, enabling reliable pressure measurement while maintaining close proximity to the damper for compact installation
2Reliability
If safety distance is maintained after flow disturbances for accurate measurement, then measurement reliability improves, but device complexity increases due to space requirements
Solution Approach 1:
Protective walls act as intermediaries that enable reliable measurement without requiring large safety distances. The walls shield the measurement points from flow disturbances, allowing probes to be positioned close to the damper while maintaining measurement reliability
Solution Approach 2:
The solution moves the measurement protection from the axial dimension (distance along flow direction) to the radial dimension (walls perpendicular to flow). By placing walls around the measurement points, reliability is achieved without increasing the axial space requirement, enabling compact installation
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution provides enhanced pressure data measurement, protects against flow disturbances, and allows for more compact installation, improving the accuracy and efficiency of air flow control in ventilation systems.
Implementation Method 1
each measurement area comprises at least one measurement probe having a measurement point for measuring pressure
Data Source
Figure 1~2
Figure 3~6
Figure 7~9
AI summary
An air flow control unit for controlling air flow in a duct, comprising a damper (10), which is arranged to be installed to the duct, wherein the air flow unit comprises a measurement unit comprising at least two measurement areas (20a, 20b, 20c,...) so that one measurement area is arranged on different side of the damper (10) in air flow direction than another measurement area, wherein each measurement area comprises at least one measurement probe (21a, 21b, 21c,...) having a measurement point (22a, 22b, 22c,...) for measuring pressure, the first measurement area (20a) is arranged on the inlet side of the damper (10), and the first measurement area comprises a first measurement probe (21a) having a first measurement point (22a), and a first wall (23a) behind the first measurement point in air flow direction causing a change in the air flow at the first measurement area (20a).